01-09-2024, 04:27 AM
2825, at a COAL of 2.260. Actually OAL has only a small effect on node location. I use a window for this node of 2797-2850 at 22" (I use a comparator-range of +/- 1% of "perfect" barrel time. So 2790 for your barrel... probably "that guy" or really close.
I developed a model (approximate mechanical model with some experimental constants) off of Chris Long's work, Optimal barrel time (Long family.com or something like that, it's close to midnite right now). I flipped it sideways so a regular guy could use it in load workups, not just theoretical engineer-types - lol. I have it in excel.
Of note on this, I have had 2 or so loads for a different 22" barrel-different cartridge, both were like 2815 and 2830, both were dang on-the-money less than 0.5"/100 yd group-type loads. First one of those, when I switched powder lots, went from 2815-2810-2817 give or take.
If you're ready for one of the secrets I found within his work, the cartridge/bullet/powder doesn't matter as much as the barrel length (and oal to some extent).
Blew my mind when I realized this.
I developed a model (approximate mechanical model with some experimental constants) off of Chris Long's work, Optimal barrel time (Long family.com or something like that, it's close to midnite right now). I flipped it sideways so a regular guy could use it in load workups, not just theoretical engineer-types - lol. I have it in excel.
Of note on this, I have had 2 or so loads for a different 22" barrel-different cartridge, both were like 2815 and 2830, both were dang on-the-money less than 0.5"/100 yd group-type loads. First one of those, when I switched powder lots, went from 2815-2810-2817 give or take.
If you're ready for one of the secrets I found within his work, the cartridge/bullet/powder doesn't matter as much as the barrel length (and oal to some extent).
Blew my mind when I realized this.